Debian DLA-1232-1：linux 安全性更新 (Meltdown)
high Nessus Plugin ID 105622
語系：
Synopsis
遠端 Debian 主機缺少一個安全性更新。描述
在 Linux 核心中發現數個弱點，這些弱點可能會導致權限提升、拒絕服務或資訊洩漏。CVE-2017-5754 多個研究人員發現 Intel 處理器存在一個弱點，攻擊者可透過控制未經授權處理程序來讀取任意地址的記憶體，包括核心及系統上執行的其餘所有處理程序的記憶體。這種特定攻擊稱作 Meltdown，已在 Linux 的 Intel x86-64 架構核心中使用名為核心分頁表隔離的修補程式集解決，該修補程式集幾乎將核心與使用者空間位址對應完全隔開，以利防止攻擊。此解決方案可能會影響到效能，可以在開機時將「pti=off」傳遞至核心命令行加以停用。CVE-2017-17558 Andrey Konovalov 報告 USB 核心在初始化期間未正確處理某些錯誤情形。具備特別設計之 USB 裝置的實際存在使用者可利用此問題造成拒絕服務 (當機或記憶體損毀)，或可能造成權限提升。CVE-2017-17741 Dmitry Vyukov 報告如果有啟用 kvm_mmio 追蹤點，x86 的 KVM 實作在模擬 MMIO 寫入時會過度讀取記憶體中的資料。客戶機虛擬機器有可能利用此問題，藉此造成拒絕服務 (損毀)。CVE-2017-17805 發現 Salsa20 區塊加密的部分實作未正確處理零長度輸入。本機使用者可利用此問題，造成拒絕服務 (損毀) 或可能有其他影響。CVE-2017-17806 發現 HMAC 實作可以與需要金鑰的基礎雜湊演算法合用，但這並非預定用法。本機使用者可利用此問題，造成拒絕服務 (當機或記憶體損毀)，或可能執行提升權限。CVE-2017-17807 Eric Biggers 發現 KEYS 子系統在將金鑰新增至處理程序的預設 keyring 時，缺少寫入權限檢查。本機使用者可利用此問題，造成拒絕服務或取得敏感資訊。針對 Debian 7「Wheezy」，這些問題已在 3.2.96-3 版本中修正。建議您升級 linux 套件。注意：Tenable Network Security 已直接從 DLA 安全性公告擷取前置描述區塊。Tenable 已盡量在不造成其他問題的前提下，嘗試自動清理並將其格式化。解決方案
升級受影響的套件。另請參閱
https://lists.debian.org/debian-lts-announce/2018/01/msg00004.html
Plugin 詳細資訊
嚴重性: High
ID: 105622
檔案名稱: debian_DLA-1232.nasl
版本: 3.8
類型: local
代理程式: unix
已發布: 2018/1/8
已更新: 2021/1/11
支持的傳感器: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent
風險資訊
VPR
風險因素: High
分數: 8.3
CVSS v2
風險因素: High
基本分數: 7.2
時間分數: 6.3
媒介: AV:L/AC:L/Au:N/C:C/I:C/A:C
時間媒介: E:H/RL:OF/RC:C
弱點資訊
CPE: p-cpe:/a:debian:debian_linux:linux-doc-3.2, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-486, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-4kc-malta, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-5kc-malta, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-686-pae, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-amd64, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-armel, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-armhf, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-i386, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-ia64, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-mips, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-mipsel, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-powerpc, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-s390, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-s390x, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-all-sparc, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-amd64, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-common, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-common-rt, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-iop32x, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-itanium, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-ixp4xx, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-kirkwood, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-loongson-2f, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-mckinley, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-mv78xx0, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-mx5, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-octeon, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-omap, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-orion5x, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-powerpc, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-powerpc-smp, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-powerpc64, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-r4k-ip22, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-r5k-cobalt, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-r5k-ip32, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-rt-686-pae, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-rt-amd64, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-s390x, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-sb1-bcm91250a, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-sb1a-bcm91480b, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-sparc64, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-sparc64-smp, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-versatile, p-cpe:/a:debian:debian_linux:linux-headers-3.2.0-4-vexpress, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-486, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-4kc-malta, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-5kc-malta, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-686-pae, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-686-pae-dbg, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-amd64, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-amd64-dbg, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-iop32x, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-itanium, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-ixp4xx, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-kirkwood, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-loongson-2f, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-mckinley, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-mv78xx0, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-mx5, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-octeon, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-omap, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-orion5x, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-powerpc, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-powerpc-smp, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-powerpc64, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-r4k-ip22, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-r5k-cobalt, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-r5k-ip32, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-rt-686-pae, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-rt-686-pae-dbg, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-rt-amd64, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-rt-amd64-dbg, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-s390x, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-s390x-dbg, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-s390x-tape, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-sb1-bcm91250a, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-sb1a-bcm91480b, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-sparc64, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-sparc64-smp, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-versatile, p-cpe:/a:debian:debian_linux:linux-image-3.2.0-4-vexpress, p-cpe:/a:debian:debian_linux:linux-libc-dev, p-cpe:/a:debian:debian_linux:linux-manual-3.2, p-cpe:/a:debian:debian_linux:linux-source-3.2, p-cpe:/a:debian:debian_linux:linux-support-3.2.0-4, p-cpe:/a:debian:debian_linux:xen-linux-system-3.2.0-4-686-pae, p-cpe:/a:debian:debian_linux:xen-linux-system-3.2.0-4-amd64, cpe:/o:debian:debian_linux:7.0
必要的 KB 項目: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l
可被惡意程式利用: true
可輕鬆利用: Exploits are available
修補程式發佈日期: 2018/1/7
參考資訊
CVE: CVE-2017-17558, CVE-2017-17741, CVE-2017-17805, CVE-2017-17806, CVE-2017-17807, CVE-2017-5754
IAVA: 2018-A-0019